What led to Helge Ingstad's discovery at L'Anse aux Meadows in the 1960s？
A. The account of Vinland's wild grapes in the sagas
B. The search for a favorable place for a colony
C. The idea that Vinland referred to a meadow
D. The interest in writing about a haunted place
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According to the passage, how did the electronic era get its name？
A. Electronics became a standard subject taught in schools．
B. The discovery of electrons occurred during the period．
C. Writers of the period predicted the invention of computers．
D. The technology sent electrical signals along electrical wires．
Which sentence below best expresses the essential information in the highlighted sentence
A. The scientific study of soils is improving soil quality in many regions worldwide．
B. Few people would disagree that soil quality is as diminished as scientists say it is．
C. The number of scientists who specialize in the study of soils has been decreasing．
D. Most scientists agree that soil degradation is occurring in many parts of the world．
The word stunt in paragraph 5 is closest in meaning to
A. speed
B. hide
C. cause
D. limit
According to the passage, which of the following is a serious consequence of irrigation？
A. Loss of flesh water for drinking
B. Decrease in the level of rivers
C. Excessive buildup of salts in the soil
D. Increase in the rate of soil erosion
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